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The microstructure and mechanical properties of parent metal for 700L beam steel with different titanium contents and specimens with metal active gas (MAG) welding are compared and studied. The results showed that the ferrite grains in the microstructure of test steel were 3~5 μm, there were a small quantity of deformation bands, yield strength was 678 MPa, tensile strength was 760 MPa and elongation was 17.0% when Ti content was 0.11%; the ferrite grains in the microstructure was 4~8 μm, there were a small quantity of pearlite grains, yield strength was 658 MPa, tensile strength was 734 MPa and elongation was 24.0% when Ti content was 0.07%; the strength of the two types of test steel was increased by about 10 MPa, but elongation was decreased by 1.0 and 3.0 percent points respectively and property of root bending of 180° (d = 2a) was qualified after MAG welding; the content of low carbon martensite was increased and microstructure of heat affected zone for test steel was refined with the increase of Ti content.
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对不同钛含量的700L汽车大梁钢母材及熔化极性气体保护焊(MAG)焊接后试样的显微组织、力学性能进行对比研究。结果表明:钛含量为0.11%时,试验钢显微组织中铁素体晶粒为3~5 μm,还有少量的变形带,屈服强度为678 MPa,抗拉强度为760 MPa,伸长率为17.0%;钛含量为0.07%时,显微组织中铁素体晶粒为4~8 μm,还有少量的珠光体颗粒,屈服强度为658 MPa,抗拉强度为734 MPa,伸长率为24.0%;MAG焊接后,两种试验钢的强度升高10 MPa左右,但伸长率分别降低1.0、3.0个百分点,背弯180°(d=2a)性能合格;随着钛含量的增加,试验钢的热影响区显微组织得到细化,低碳马氏体含量有所增多。
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王 鑫(1982-),男,山东省德州市人,工程师,现从事液压油缸的设计和热处理技术文件的编制工作。
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王 鑫(1982-),男,山东省德州市人,工程师,现从事液压油缸的设计和热处理技术文件的编制工作。
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王 鑫(1982-),男,山东省德州市人,工程师,现从事液压油缸的设计和热处理技术文件的编制工作。
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试验钢母材显微组织, figureFileSmall=VxznAXuUHaLlyWQx2SPuvQ==, figureFileBig=WGLX2s1SRXh0KhDusL9MTQ==, tableContent=null), ArticleFig(id=1198266728909206299, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1198266572335837660, language=EN, label=null, caption=null, figureFileSmall=ijC8awl4lqzKPlx8b6eLmg==, figureFileBig=GRaT5jS7r5bd8R1u37Y+tw==, tableContent=null), ArticleFig(id=1198266728976315164, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1198266572335837660, language=CN, label=图2, caption=
试验钢焊接组织 (a)、(b)、(c)、(d):试验钢1;(e)、(f)、(g)、(h):试验钢2
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试验钢180°冷弯照片, figureFileSmall=fI5hNAygYkZbeRL8diBY2A==, figureFileBig=bGsP+Dr6lk6pjRKqt6NFZw==, tableContent=null), ArticleFig(id=1198266729186030367, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1198266572335837660, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 名称 | C | Si | Mn | P | S | Alt | Nb | Ti |
| 试验钢1 | 0.08 | 0.16 | 1.51 | 0.014 | 0.003 | 0.04 | 0.03 | 0.11 |
| 试验钢2 | 0.08 | 0.10 | 1.60 | 0.012 | 0.002 | 0.03 | 0.03 | 0.07 |
| GB/T 3273—2015 | ≤0.12 | ≤0.6 | ≤2.0 | ≤0.025 | ≤0.015 | ≥0.02 | ω(Nb)+ω(V)+ω(Ti)≤0.22 |
), ArticleFig(id=1198266729261527840, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1198266572335837660, language=CN, label=表1, caption=
试验钢的化学成分及标准要求(质量分数)%
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| 名称 | C | Si | Mn | P | S | Alt | Nb | Ti |
| 试验钢1 | 0.08 | 0.16 | 1.51 | 0.014 | 0.003 | 0.04 | 0.03 | 0.11 |
| 试验钢2 | 0.08 | 0.10 | 1.60 | 0.012 | 0.002 | 0.03 | 0.03 | 0.07 |
| GB/T 3273—2015 | ≤0.12 | ≤0.6 | ≤2.0 | ≤0.025 | ≤0.015 | ≥0.02 | ω(Nb)+ω(V)+ω(Ti)≤0.22 |
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| 焊接方式 | 焊丝型号 | 焊丝规格/mm | 焊接电流/A | 焊接电压/V | 焊接速度/(cm·min-1) |
| MAG焊 | ER50-6 | 1.2 | 200~250 | 23~28 | 28~38 |
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试验钢的焊接工艺参数
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| 焊接方式 | 焊丝型号 | 焊丝规格/mm | 焊接电流/A | 焊接电压/V | 焊接速度/(cm·min-1) |
| MAG焊 | ER50-6 | 1.2 | 200~250 | 23~28 | 28~38 |
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| 试验钢 | 状态 | 屈服强度/MPa | 抗拉强度/MPa | 伸长率/% | 冷弯(d=2a,180°) |
| 试验钢1 | 母材 | 678 | 760 | 17.0 | |
| 焊接 | 685 | 767 | 16.0 | 合格 |
| 试验钢2 | 母材 | 658 | 734 | 24.0 | |
| 焊接 | 664 | 744 | 21.0 | 合格 |
| GB/T 3273—2015 | | ≥620 | 700~800 | ≥14.0 | |
), ArticleFig(id=1198266729496408868, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1198266572335837660, language=CN, label=表3, caption=
试验钢母材、焊接后试样力学性能
, figureFileSmall=null, figureFileBig=null, tableContent=
| 试验钢 | 状态 | 屈服强度/MPa | 抗拉强度/MPa | 伸长率/% | 冷弯(d=2a,180°) |
| 试验钢1 | 母材 | 678 | 760 | 17.0 | |
| 焊接 | 685 | 767 | 16.0 | 合格 |
| 试验钢2 | 母材 | 658 | 734 | 24.0 | |
| 焊接 | 664 | 744 | 21.0 | 合格 |
| GB/T 3273—2015 | | ≥620 | 700~800 | ≥14.0 | |
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